In this way, we could not only judge the direction of movement of tags accurately, but also judge other complicated logic, e. g. the midway return of tags.

采用这种方法不但可以准确判标签运动方向，而且可以判断标签中途返回等一些复杂逻辑。

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Interactivity, e. g. ordering of PPV movies, can be achieved through other channels than the traditional STB return channel.

互动性，如订购PPV电影可以通过传统的STB返回频道之外的其它频道实现。

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The OPC is needed for return messages (e. g. , return error messages).

返回消息（例如，返回错误消息）时会需要OPC。

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Second, in a realistic program, you should generally test the return values of all the API calls in this program immediately to detect errors (e. g., import failure).

第二，在一个实际的程序中，你一般应该立即检查程序中所有API调用的返回值，以检测错误(例如导入失败)。

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To ensure mail items be duly received by the department, and to avoid unnecessary delivery delay (e. g. return to sender), please pay sufficient postage before Posting mail items to this department.

为确保本署能收妥邮件，并免却不必要的派递延误(例如退回寄件人)，在投寄邮件前，请切记贴上足够邮资。

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To ensure mail items be duly received by the department, and to avoid unnecessary delivery delay (e. g. return to sender), please pay sufficient postage before Posting mail items to this department.

为确保本署能妥收邮件，及免却不必要的派递延误(例如，退回寄件人)，请切记投寄邮件前贴上足够邮资。

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To ensure mail items be duly received by the department, and to avoid unnecessary delivery delay (e. g. return to sender), please pay sufficient postage before Posting mail items to this department.

为确保本署能妥收邮件，及免却不必要的派递延误(例如，退回寄件人)，请切记投寄邮件前贴上足够邮资。

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